Jeffry's Sock of Filtering
This unique item is the long lost sock belonging to the halfling, Jeffry. It has become imbued with the ability to filter harmful toxins from anything poured through it such as making coffee through it. Any poisons of significance will be removed by the sock.
Drawback: All liquids filtered through the dirty sock smell like sweaty feet.
Jeffry doesn't miss the sock, he has more, and continues making coffee with them when travelling on adventures.